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Which one would you like to choose? Milk, orange juice, cocktail, cola, Sprite Each has a different meaning
I prefer milk
The following substances are pure ()
A. Copper B. air C. mineral water D. marble
A. Copper contains only one substance, which belongs to pure substance, so a is correct; B, air contains oxygen, nitrogen, carbon dioxide and other substances, which belongs to mixture, so B is wrong. C, mineral water contains water and some minerals dissolved in water, which belongs to mixture. So C is wrong. D, marble is mainly composed of calcium carbonate, which belongs to mixture. So C is wrong. So a is selected
(Jilin, 2011) among the following substances, the one that belongs to pure substance is ()
A. Oxygen B. juice C. air D. seawater
A. Oxygen is composed of one substance, which belongs to pure substance; B. fruit juice contains water and some substances dissolved in water, which belongs to mixture; C. air contains nitrogen, oxygen and other substances, which belongs to mixture; D. sea water contains water and some substances dissolved in water, which belongs to mixture
The following substances are pure ()
A. Dilute sulfuric acid B. disinfectant alcohol C. hydrogen peroxide D. mineral water
A. Dilute sulfuric acid contains sulfuric acid and water, which belongs to the mixture; B. disinfectant alcohol contains water and alcohol, which belongs to the mixture; C. hydrogen peroxide is composed of one substance, which belongs to the pure substance; D. mineral water contains water and some minerals, which belongs to the mixture
RELATED INFORMATIONS
- 1. One of the important ways to learn chemistry is to recognize substances by classification A. Fresh air B. carbon dioxide C. mineral water D. clarified lime water
- 2. The following substances are pure: a pure sugar water B fresh air C ice and water D milk
- 3. In juice, milk, mineral water and beer, which one contains organic matter? (organic matter is a compound composed of C and H elements)
- 4. The following solutions are a. distilled water B. milk C. iodine D. ice water
- 5. A supermarket shipped 120 cases of juice, and the milk was 14 more than juice. How many more cases of milk than juice? How many cartons of milk are delivered?
- 6. A supermarket transported 120 cases of juice, 25% more than the milk (1) How many cartons of milk have you brought in? (2) Use two ways to find out the number of boxes with more juice than milk Urgent! Good answer, more points!
- 7. A person can buy mineral water with ten yuan, one yuan for a bottle, and three empty bottles can be exchanged for another. How many bottles can this person drink?
- 8. Who knows the profit of the supermarket? My friend opened a supermarket. The daily turnover is 1000 yuan?
- 9. What is the cost value of a bottle of mineral water in Nongfu mountain spring The cost value of large and small bottles varies from 1.2 to 3 yuan (mainly on the train) for shops outside
- 10. If the purchase price of a commodity is 250 yuan and the profit margin is 15.2% when it is sold at a 10% discount on the marked price, then the marked price of each commodity is 100 yuan______ ．
- 11. Water, beer, milk, soy sauce which belongs to the pure? What is the definition of slow oxidation? Which of carbon monoxide, carbon dioxide, sulfur dioxide or nitrogen is allowed to emit into the air? What substance consumes oxygen in the bulb to protect tungsten wire?
- 12. Mom has 15 yuan. Is it enough to buy one kilogram of milk and one kilogram of eggs?
- 13. The original price of Mengniu milk is 3 yuan per box. During the activity, "buy five get one free". If you buy 120 boxes, how much does it cost? How much is equivalent to a discount? The perimeter of a rectangle is 92cm. If its length decreases by 1 / 3 and its width increases by 5 / 8, then its perimeter remains unchanged. What is the area of the rectangle?
- 14. Is a bottle of ordinary mineral water the same weight when it freezes as when it doesn't
- 15. Sell 360 bottles of mineral water, all 20% off the purchase price, a bottle of 1 yuan, 20% interest rate, ask the price
- 16. Why is mineral water 18.9 liters?
- 17. Judgment: the volume of a cuboid fish tank is 500 cubic decimeters, its volume is 500 liters
- 18. How many water molecules are contained in 500ml mineral water? (the known density of water is 1g / ml, other substances are ignored)
- 19. Pour a bottle of mineral water into a paper cup to see how many cups can be filled? 2. How many milliliters of water is there in a paper cup, and how many cups are about 1L 3. Say, those items are marked with ml, L Irregular shaped objects (such as potatoes, pears, plasticine, stones, etc.) How to find their volume? Qwq people
- 20. A letter to a friend